Problem:    Cannot complete user names.
Solution:   Add user name completion.  (Dominique Pelle)

Problem:    No completion for :history command.
Solution:   Add the completion and update the docs. Also fix ":behave"
            completion. (Dominique Pelle)

Problem:    Small mistakes in comments, proto and indent.
Solution:   Fix the mistakes.

Also update runtime files

Problem:    Not all completions are available to user commands.
Solution:   Add "color", "compiler", "file_in_path" and "locale". (Dominique
            Pelle)

Problem:    Can't intercept a character that is going to be inserted.
Solution:   Add the InsertCharPre autocommand event. (Jakson A. Aquino)